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# paymentQueue(_:updatedTransactions:)

Tells an observer that one or more transactions have been updated.

```
func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction])
```

## Parameters

`queue`

The payment queue that updated the transactions.

`transactions`

An array of the transactions that were updated.

## Discussion

The application should process each transaction by examining the transaction’s [`transactionState`](/documentation/StoreKit/SKPaymentTransaction/transactionState) property. If [`transactionState`](/documentation/StoreKit/SKPaymentTransaction/transactionState) is [`SKPaymentTransactionState.purchased`](/documentation/StoreKit/SKPaymentTransactionState/purchased), payment was successfully received for the desired functionality. The application should make the functionality available to the user. If [`transactionState`](/documentation/StoreKit/SKPaymentTransaction/transactionState) is [`SKPaymentTransactionState.failed`](/documentation/StoreKit/SKPaymentTransactionState/failed), the application can read the transaction’s error property to return a meaningful error to the user.

Once a transaction is processed, it should be removed from the payment queue by calling the payment queue’s [`finishTransaction(_:)`](/documentation/StoreKit/SKPaymentQueue/finishTransaction(_:)) method, passing the transaction as a parameter.

> Important:
> Once the transaction is finished, StoreKit can’t tell you that this item is already purchased. It is important that applications process the transaction completely before calling ``doc://com.apple.storekit/documentation/StoreKit/SKPaymentQueue/finishTransaction(_:)``.

## See Also

  [In-App Purchase Programming Guide](https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/StoreKitGuide/Introduction.html#//apple_ref/doc/uid/TP40008267)


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